htc_drv_gpio.c

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/*
 * Copyright (c) 2010-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "htc.h"

/******************/
/*     BTCOEX     */
/******************/

#define ATH_HTC_BTCOEX_PRODUCT_ID "wb193"

#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT

/*
 * Detects if there is any priority bt traffic
 */
static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
{
    struct ath_btcoex *btcoex = &priv->btcoex;
    struct ath_hw *ah = priv->ah;

    if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
        btcoex->bt_priority_cnt++;

    if (time_after(jiffies, btcoex->bt_priority_time +
            msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
        clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
        clear_bit(OP_BT_SCAN, &priv->op_flags);
        /* Detect if colocated bt started scanning */
        if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
            ath_dbg(ath9k_hw_common(ah), BTCOEX,
                "BT scan detected\n");
            set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
            set_bit(OP_BT_SCAN, &priv->op_flags);
        } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
            ath_dbg(ath9k_hw_common(ah), BTCOEX,
                "BT priority traffic detected\n");
            set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
        }

        btcoex->bt_priority_cnt = 0;
        btcoex->bt_priority_time = jiffies;
    }
}

/*
 * This is the master bt coex work which runs for every
 * 45ms, bt traffic will be given priority during 55% of this
 * period while wlan gets remaining 45%
 */
static void ath_btcoex_period_work(struct work_struct *work)
{
    struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
                           coex_period_work.work);
    struct ath_btcoex *btcoex = &priv->btcoex;
    struct ath_common *common = ath9k_hw_common(priv->ah);
    u32 timer_period;
    int ret;

    ath_detect_bt_priority(priv);

    ret = ath9k_htc_update_cap_target(priv,
              test_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags));
    if (ret) {
        ath_err(common, "Unable to set BTCOEX parameters\n");
        return;
    }

    ath9k_hw_btcoex_bt_stomp(priv->ah, test_bit(OP_BT_SCAN, &priv->op_flags) ?
                 ATH_BTCOEX_STOMP_ALL : btcoex->bt_stomp_type);

    ath9k_hw_btcoex_enable(priv->ah);
    timer_period = test_bit(OP_BT_SCAN, &priv->op_flags) ?
        btcoex->btscan_no_stomp : btcoex->btcoex_no_stomp;
    ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
                     msecs_to_jiffies(timer_period));
    ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
                     msecs_to_jiffies(btcoex->btcoex_period));
}

/*
 * Work to time slice between wlan and bt traffic and
 * configure weight registers
 */
static void ath_btcoex_duty_cycle_work(struct work_struct *work)
{
    struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
                           duty_cycle_work.work);
    struct ath_hw *ah = priv->ah;
    struct ath_btcoex *btcoex = &priv->btcoex;
    struct ath_common *common = ath9k_hw_common(ah);

    ath_dbg(common, BTCOEX, "time slice work for bt and wlan\n");

    if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
        test_bit(OP_BT_SCAN, &priv->op_flags))
        ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
    else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
        ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);

    ath9k_hw_btcoex_enable(priv->ah);
}

static void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
{
    struct ath_btcoex *btcoex = &priv->btcoex;

    btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
    btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
        btcoex->btcoex_period / 100;
    btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
                   btcoex->btcoex_period / 100;
    INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
    INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
}

/*
 * (Re)start btcoex work
 */

static void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
{
    struct ath_btcoex *btcoex = &priv->btcoex;
    struct ath_hw *ah = priv->ah;

    ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex work\n");

    btcoex->bt_priority_cnt = 0;
    btcoex->bt_priority_time = jiffies;
    clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
    clear_bit(OP_BT_SCAN, &priv->op_flags);
    ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
}


/*
 * Cancel btcoex and bt duty cycle work.
 */
static void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
{
    cancel_delayed_work_sync(&priv->coex_period_work);
    cancel_delayed_work_sync(&priv->duty_cycle_work);
}

void ath9k_htc_start_btcoex(struct ath9k_htc_priv *priv)
{
    struct ath_hw *ah = priv->ah;

    if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE) {
        ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
                       AR_STOMP_LOW_WLAN_WGHT, 0);
        ath9k_hw_btcoex_enable(ah);
        ath_htc_resume_btcoex_work(priv);
    }
}

void ath9k_htc_stop_btcoex(struct ath9k_htc_priv *priv)
{
    struct ath_hw *ah = priv->ah;

    if (ah->btcoex_hw.enabled &&
        ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
        if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
            ath_htc_cancel_btcoex_work(priv);
        ath9k_hw_btcoex_disable(ah);
    }
}

void ath9k_htc_init_btcoex(struct ath9k_htc_priv *priv, char *product)
{
    struct ath_hw *ah = priv->ah;
    struct ath_common *common = ath9k_hw_common(ah);
    int qnum;

    /*
     * Check if BTCOEX is globally disabled.
     */
    if (!common->btcoex_enabled) {
        ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_NONE;
        return;
    }

    if (product && strncmp(product, ATH_HTC_BTCOEX_PRODUCT_ID, 5) == 0) {
        ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_3WIRE;
    }

    switch (ath9k_hw_get_btcoex_scheme(priv->ah)) {
    case ATH_BTCOEX_CFG_NONE:
        break;
    case ATH_BTCOEX_CFG_3WIRE:
        priv->ah->btcoex_hw.btactive_gpio = 7;
        priv->ah->btcoex_hw.btpriority_gpio = 6;
        priv->ah->btcoex_hw.wlanactive_gpio = 8;
        priv->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
        ath9k_hw_btcoex_init_3wire(priv->ah);
        ath_htc_init_btcoex_work(priv);
        qnum = priv->hwq_map[WME_AC_BE];
        ath9k_hw_init_btcoex_hw(priv->ah, qnum);
        break;
    default:
        WARN_ON(1);
        break;
    }
}

#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */

/*******/
/* LED */
/*******/

#ifdef CONFIG_MAC80211_LEDS
void ath9k_led_work(struct work_struct *work)
{
    struct ath9k_htc_priv *priv = container_of(work,
                           struct ath9k_htc_priv,
                           led_work);

    ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
              (priv->brightness == LED_OFF));
}

static void ath9k_led_brightness(struct led_classdev *led_cdev,
                 enum led_brightness brightness)
{
    struct ath9k_htc_priv *priv = container_of(led_cdev,
                           struct ath9k_htc_priv,
                           led_cdev);

    /* Not locked, but it's just a tiny green light..*/
    priv->brightness = brightness;
    ieee80211_queue_work(priv->hw, &priv->led_work);
}

void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
{
    if (!priv->led_registered)
        return;

    ath9k_led_brightness(&priv->led_cdev, LED_OFF);
    led_classdev_unregister(&priv->led_cdev);
    cancel_work_sync(&priv->led_work);
}

void ath9k_init_leds(struct ath9k_htc_priv *priv)
{
    int ret;

    if (AR_SREV_9287(priv->ah))
        priv->ah->led_pin = ATH_LED_PIN_9287;
    else if (AR_SREV_9271(priv->ah))
        priv->ah->led_pin = ATH_LED_PIN_9271;
    else if (AR_DEVID_7010(priv->ah))
        priv->ah->led_pin = ATH_LED_PIN_7010;
    else
        priv->ah->led_pin = ATH_LED_PIN_DEF;

    /* Configure gpio 1 for output */
    ath9k_hw_cfg_output(priv->ah, priv->ah->led_pin,
                AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
    /* LED off, active low */
    ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);

    snprintf(priv->led_name, sizeof(priv->led_name),
        "ath9k_htc-%s", wiphy_name(priv->hw->wiphy));
    priv->led_cdev.name = priv->led_name;
    priv->led_cdev.brightness_set = ath9k_led_brightness;

    ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &priv->led_cdev);
    if (ret < 0)
        return;

    INIT_WORK(&priv->led_work, ath9k_led_work);
    priv->led_registered = true;

    return;
}
#endif

/*******************/
/*  Rfkill     */
/*******************/

static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
{
    bool is_blocked;

    ath9k_htc_ps_wakeup(priv);
    is_blocked = ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
                         priv->ah->rfkill_polarity;
    ath9k_htc_ps_restore(priv);

    return is_blocked;
}

void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
{
    struct ath9k_htc_priv *priv = hw->priv;
    bool blocked = !!ath_is_rfkill_set(priv);

    wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
}

void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
{
    if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
        wiphy_rfkill_start_polling(priv->hw->wiphy);
}